35-2 nervous system
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Created by:
robfletcher7 on March 24, 2010
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10 terms
Terms | Definitions |
|---|---|
 Neuron | cell that carries messages thoughout the nervous system |
| cell body | largest part of a typical neuron; contains the nucleus and much of the cytoplasm |
| dendrite | extension of the cell body of a neuron that carries impulses from the envoronment or from other neurons towards the cell body |
| axon | long fiber that carries impulses away from the cell body of a neuron |
| myelin sheath | insulating membrane surrounding axon in some neurons |
| resting potential | electrical charge across the cell membrane of a resting neuron |
| action potential | reversal of charges across the cell membrane of a neuron; also called a nerve impulse |
| threshold | minimum level of a stimulus required to activate a neuron |
| synapse | location at which a neuron can transfer an impulse to another cell |
| neurotransmitter | chemical used by a neuron to transmit an impulse across a synapse to another cell |
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